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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad3f934a78c23eefe307d6dfe329ba3804c01247b0e13911f4e17c4122a8393' 
  AND token = '8iW9STa7HrXt/39WrVJ82R/BnrtTRHz6y25ZCCFv9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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