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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e7c985c5fa2a53a5b8efe201f20a4ae8e2f15a3c9b2b5f5a8963078bddaafd' 
  AND token = 'b4JdoGJYJ/wwudSNS+h1zkROxq6B+rEymMerRSZPerQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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