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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403a6c11d1d8da0ae2a77e4d6d9f75c1ef2c703f2c43fec36e232df4250942c1' 
  AND token = 'Rxeq2xbYq3PsbAnyeyFcIks3ICQC/s8qAetd8TMqeAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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