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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9042d2d904bedafb6d3995ef13cb8f8392a0f2de5764261b068e0ede7df333' 
  AND token = 'ao+zj/mN6pmc1OXzEz0b8okVaubHniH6P5IiSfrHxCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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