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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f647f9bfb91fbfe92ec38e3399c1409bc332009223ebb8317628d470831e8a1a' 
  AND token = 'kwE7Pwzp+/mOc85X3i6dVOhgw2iRz15VHkSgG8GTP6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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