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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba897d1f2c4e7bba209cea53f73dff76a16c49dbab0731f59c540b5e805ff30' 
  AND token = 'JCoQQ180HNNRsJZovrqZgFBR+Rl2ICB4245524VzwAA=' 
  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"
    }
  }
}