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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc1b3d8fa0fafaa73c13e6811874ea6b6653048f83312fb13c9b0b71fe12c88' 
  AND token = 'ZNqn1Cr/guLUoEqL9LeG+0KzoKwUUcPQkh5Hu1IjUps=' 
  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"
    }
  }
}