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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9346b07e44888f039c02d6395ab45f050f48838769b1b78b1688fd29f36758' 
  AND token = 'fG3Eoh3kRYpKNxqtjt3/KDtI2T145fyYDbI3W7n7oE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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