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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baeb229a7f6ab8a33ff2c2ca71ad1a66b0d899fe24a620cf8cbb82cc41511c4' 
  AND token = 'jUcoltvZJlKXI2SyzDP8phSRVauws0klBeLdRtV8SBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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