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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12060c0a6bb5f5a71fc7185da437f159da64eac724f72347bf80f806d69dd291' 
  AND token = 'U64D5qQyKcYKJRJcer/ifl4TMQAA4yPcQ1Ob2xz+JSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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