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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9527fe7816ded770b24ec1ec186c0cf03449cb196fa4e424808b20dd99ca98e6' 
  AND token = '9c53m1c007xGEnqW70dSDsGbu6aAfSbOHwACY5kBqxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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