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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6224172d3afac3e00216e3c7651d1a00e55fab74b35f22669ca2571d678eff' 
  AND token = '1pgrgkYXokORV34CKXTnAPx9uniWi/RKiOE8ufVZgxM=' 
  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"
    }
  }
}