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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d86e300621d259d9dc360d61ecf2635c1010db3feb253627ae8b6ceb1f22e57' 
  AND token = 'v5x+px8UcqICLSHsciw8YI/YUJ0f8aEKGFdJZbXHewg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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