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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f5fe5346d55be6dfb7a4e173dd4a7de6796349d4a5af017e8ba0739ab4c03e' 
  AND token = '71t5sVPl3aAV4sfP/EMymfIRp6nPUkxE6PTH1s5Nf10=' 
  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"
    }
  }
}