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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f8c3202a09b4d479a7b02ee96fb4d88a0e61b3affc0072b484716a27fe224f' 
  AND token = 'Xz0s/80HkYPs6NQHSi+9YvFdcBVBwSc50E5RR4AVXaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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