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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bbe3bd76b2500e7d3d165bb83bee79d80d1506f9cb88e721d1922f2ffdbc93' 
  AND token = 'hj7FaYR9Piwy/YQpeQNqap51R/et9uAejEhQ8vXld3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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