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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29b19ca2bd322fd6f034659dbe850309b970645fd97d23ad055b68233787d14' 
  AND token = 'nSXEQT3XzE0tZQP0u2H79J5R0PQoePUwMlGd26MJ/6c=' 
  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"
    }
  }
}