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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689afbe3fcbc7da5c94a95d51aa889f72d1d9ebaca8a815995e14d1b8f002da5' 
  AND token = '90nC/A+1JgUmuVuXLLdw/yZ8mgDHVS2+8k1uvPUXjP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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