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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26edbda3c187333f5377c556d41ce12b769c4375f6224aebd5c4b03d1e0afef' 
  AND token = 't68Zk9E8FzULlsEfq2HUkCFU1shfpmeV71SBA3i3loQ=' 
  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"
    }
  }
}