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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8510c5e57e5d893c8c43ca837f861a5cf78152919f8c9b08b62c53239ffa212d' 
  AND token = 'RM+WoxqdKeXDxOxEtlLtY/lJA/iGuWrfkOZlXlQuwd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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