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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e2fc35089589f3cff0b15015447c0facb659ecb5f77d67b76dc2fd9ddaa64d' 
  AND token = 'FRKrQMj7z+KOq8oRvzHuJbyFDMtZryHlDjvOE0HIE6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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