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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2e45670de12521a0e8a1d63198c9178e6f048309d87978b10d2040e1185c1e' 
  AND token = 'dRsPSfHsKS353KBL+A6hSaExb+8eEcLBwtD/cpVkXVQ=' 
  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"
    }
  }
}