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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d1f4e3fbeeb4cc0786c13fd45c58ca62c928d277115d352f05bb6310a2c147' 
  AND token = 'KPNFK8ov0BuPrWUuwdUzddn7dVIScrnjIE6tG/EOW8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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