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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a4ed26c75fb70cd9878af990a292ae8b179b590ed3045be43b417e8bb77e47' 
  AND token = 'UVH31TQlb0V5PfDCpFYY1C+n1Q4CDJGAEh8Eyq4MD+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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