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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b8c135f05347976df19a2a50a621660406208a87920d893ce2b8630d236313' 
  AND token = 'T3CnRSHg0e7KY/D26henHcaw7bVfyI0+hDndH3PAFT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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