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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8ca4030825d51a0c139964bbd2c3741aafc246d74c5869dc3fd3ba9362e732' 
  AND token = 'hN0pPJS0OVt8rsYgyR8OxdJqkaS1GwpMdvIhAETSc9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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