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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d486d781d2eb01dcc10002d5e6a9479be15b36172fcf029e92b9c4928136d2' 
  AND token = 'XrWY2PVOJ7UUCUWnuG2/Inh7FHd3ZnsCFUrmVeVXnk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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