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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11cb0b2cb7c37947abc7a0e008683f240fab115fdca31cea77943807848d3b2' 
  AND token = 'k2Ec+Ds0UieT+o5YARNqdfHEGtkFrS1n+r2BkReW7R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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