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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7aa2d989cddddd3e5f2c50a1d65de7fef93dbe2f92adbae8594d7082cb920d7' 
  AND token = 'V3DFSRum/SnASN0jCBYH6JCXfQd2edQWFttzqnICaHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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