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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b389e8bf27b131d72f7abbf298e4a937bffbe41b64f71b57d75170dc6ca906d' 
  AND token = 'z9OP2UrKoJOOjEeUIR6ZfiYcUpw+LD/CLfWLFfZJdAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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