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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0dc523245f1a27c1ef541f201144cffb38377200fe7ac677937e3cd2c8f4cd' 
  AND token = 'k5m/TWx+E8pCKAk2U9/eI35ztXWKsYSLPxSIEIi9pqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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