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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a03260f59b0c5ed5f3801d428b997610c77fc1a93816a09fc9705bcaffeb108' 
  AND token = 'FHzDsV7WjfUXZf4z5bEHF0Zm8UCUdUYG/aBaybqTDP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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