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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b60d431d0c53278890e4ddd952c7a9734c4c1a37fe0327e3c50400746778b2d' 
  AND token = 'ljFX9rMTFFTDAwgvhzCS7T7cItLNQlz8flq536CfxGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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