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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f4d555f4f54134a407a21ca4a252715d72e60ae40cb15f61948a21f4376af6' 
  AND token = 'kQMyGOsSldl+0vHunC2QjIXjeuEkk+kG2oqCwMZ9hGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}