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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e1e0f1c8f7b503186986993989ec5dc85896d237540efa94d9ba7725526d9f' 
  AND token = 'SYLpnWPA+Ne6lISaFu4fi9gsPaq5tE1xrb3jwe5rx7U=' 
  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"
    }
  }
}