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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6978476a3dc0d86adbf07886369e48419bcb4bc2ff8ce9aad5deee4fda3770' 
  AND token = '17/bfYJeWbpwgnu4lKvDLgTgJf8HHCZOHP+3QkvNBas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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