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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369a9c4df65fe1d7cf2fcf92ea94d01038da40f9c9264f39f13c55078ca9570d' 
  AND token = '6+LLw0Gup8Tn9/ngB4xWXAdNCyAwuoi85L80INzVH6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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