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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ce4ef8794189fab524ca6c0895622cb22fe94ca654b938b5007a9a6edc6f51' 
  AND token = 'JGD3F2Yy+BoUG+fdHBEhukTKKv+FNw9tyf77DNJDreQ=' 
  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"
    }
  }
}