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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b95da311d12303f977e6b91e1ab1a456da0f00ca3067cdda3c09749c1ad55a' 
  AND token = 'Act5yewGANApUyLkiM0oqJvUhZK7osr7vdwsKH+WcwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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