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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c38a302a2cb41068ae2c9cc4e3b0cb5d0082e706a2c1f37a5da4009ae58e4f' 
  AND token = 'I26i0koDuraTZRg2dNBvtbua0i+O0zo9fAr7zsu9ZW4=' 
  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"
    }
  }
}