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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52e35cfde1b0ad4d1db8ace61db086a736640a52c6e4f0864aad27baf97e074' 
  AND token = '9n07ZyPSshaH5fFQghjXI+A6kDRekqRxqP8iDhjmRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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