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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37414e7e0ff1739ec2af960c88187af1958827e4a5dc2e9a7dc28691d866d820' 
  AND token = '+3AxJInHX3rzfjDXuGcY3QOMNvOSXM66pmq1CUe3W/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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