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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40ff9527735d514688a2942e486b2553123da07ae05a54448d7ac0393a50b7b' 
  AND token = 'tLJ896A74FJjJvg2kOICTKqrwx4s/l3JUisiUWIqV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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