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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0686ab68b6db93c68b94f1ec8f08348953aa5559e7adcb9fe28305485fe693ea' 
  AND token = 'iXIiuq0Sf4x2hO2D31K8nCmrMna4759ABmytBdmOvQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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